[PATCH V4 2/2] video: drm: exynos: Add device tree support
Leela Krishna Amudala
l.krishna at samsung.com
Thu Sep 20 19:31:26 EST 2012
Hello Inki Dae,
On Thu, Sep 20, 2012 at 11:59 AM, Inki Dae <inki.dae at samsung.com> wrote:
> Hi,
>
> I had merged this patch set but I realizes this patch has no
> descriptions enough so please add the descriptions what is this patch.
>
Will give more description and post the next version.
>
> 2012/9/6 Leela Krishna Amudala <l.krishna at samsung.com>:
>> Add device tree based discovery support for DRM-FIMD driver.
>>
>> Signed-off-by: Leela Krishna Amudala <l.krishna at samsung.com>
>> ---
>> Documentation/devicetree/bindings/fb/drm-fimd.txt | 80 +++++++++++++++++
>
> and, how about making drm folder instead of fb? so like below;
> Documentation/devicetree/bindings/drm/exynos/fimd.txt
>
Okay, will move it to the drm folder.
Best Wishes,
Leela Krishna Amudala.
> Thanks,
> Inki Dae
>
>> drivers/gpu/drm/exynos/exynos_drm_fimd.c | 95 ++++++++++++++++++++-
>> 2 files changed, 173 insertions(+), 2 deletions(-)
>> create mode 100644 Documentation/devicetree/bindings/fb/drm-fimd.txt
>>
>> diff --git a/Documentation/devicetree/bindings/fb/drm-fimd.txt b/Documentation/devicetree/bindings/fb/drm-fimd.txt
>> new file mode 100644
>> index 0000000..4ff1829
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/fb/drm-fimd.txt
>> @@ -0,0 +1,80 @@
>> +* Samsung Display Controller using DRM frame work
>> +
>> +The display controller is used to transfer image data from memory to an
>> +external LCD driver interface. It supports various color formats such as
>> +rgb and yuv.
>> +
>> +Required properties:
>> + - compatible: Should be "samsung,exynos5-fimd" or "samsung,exynos4-fb" for
>> + fimd using DRM frame work.
>> + - reg: physical base address of the controller and length of memory
>> + mapped region.
>> + - interrupts: Three interrupts should be specified. The interrupts should be
>> + specified in the following order.
>> + - VSYNC interrupt
>> + - FIFO level interrupt
>> + - FIMD System Interrupt
>> +
>> + - samsung,fimd-display: This property should specify the phandle of the
>> + display device node which holds the video interface timing with the
>> + below mentioned properties.
>> +
>> + - lcd-htiming: Specifies the horizontal timing for the overlay. The
>> + horizontal timing includes four parameters in the following order.
>> +
>> + - horizontal back porch (in number of lcd clocks)
>> + - horizontal front porch (in number of lcd clocks)
>> + - hsync pulse width (in number of lcd clocks)
>> + - Display panels X resolution.
>> +
>> + - lcd-vtiming: Specifies the vertical timing for the overlay. The
>> + vertical timing includes four parameters in the following order.
>> +
>> + - vertical back porch (in number of lcd lines)
>> + - vertical front porch (in number of lcd lines)
>> + - vsync pulse width (in number of lcd clocks)
>> + - Display panels Y resolution.
>> +
>> +
>> + - samsung,default-window: Specifies the default window number of the fimd controller.
>> +
>> + - samsung,fimd-win-bpp: Specifies the bits per pixel.
>> +
>> +Optional properties:
>> + - samsung,fimd-vidout-rgb: Video output format is RGB.
>> + - samsung,fimd-inv-vclk: invert video clock polarity.
>> + - samsung,fimd-frame-rate: Number of video frames per second.
>> +
>> +Example:
>> +
>> + The following is an example for the fimd controller is split into
>> + two portions. The SoC specific portion can be specified in the SoC
>> + specific dts file. The board specific portion can be specified in the
>> + board specific dts file.
>> +
>> + - SoC Specific portion
>> +
>> + fimd {
>> + compatible = "samsung,exynos5-fimd";
>> + interrupt-parent = <&combiner>;
>> + reg = <0x14400000 0x40000>;
>> + interrupts = <18 5>, <18 4>, <18 6>;
>> + };
>> +
>> + - Board Specific portion
>> +
>> + lcd_fimd0: lcd_panel0 {
>> + lcd-htiming = <4 4 4 480>;
>> + lcd-vtiming = <4 4 4 320>;
>> + supports-mipi-panel;
>> + };
>> +
>> + fimd {
>> + samsung,fimd-display = <&lcd_fimd0>;
>> + samsung,fimd-vidout-rgb;
>> + samsung,fimd-inv-vclk;
>> + samsung,fimd-frame-rate = <60>;
>> + samsung,default-window = <0>;
>> + samsung,fimd-win-bpp = <32>;
>> + };
>> +
>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
>> index 3701fbe..a4fa8e9 100644
>> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
>> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
>> @@ -18,6 +18,7 @@
>> #include <linux/platform_device.h>
>> #include <linux/clk.h>
>> #include <linux/pm_runtime.h>
>> +#include <linux/of.h>
>>
>> #include <video/samsung_fimd.h>
>> #include <drm/exynos_drm.h>
>> @@ -103,9 +104,18 @@ struct fimd_context {
>> struct exynos_drm_panel_info *panel;
>> };
>>
>> +static const struct of_device_id fimd_dt_match[];
>> +
>> static inline struct fimd_driver_data *drm_fimd_get_driver_data(
>> struct platform_device *pdev)
>> {
>> +#ifdef CONFIG_OF
>> + if (pdev->dev.of_node) {
>> + const struct of_device_id *match;
>> + match = of_match_ptr(fimd_dt_match);
>> + return (struct fimd_driver_data *)match->data;
>> + }
>> +#endif
>> return (struct fimd_driver_data *)
>> platform_get_device_id(pdev)->driver_data;
>> }
>> @@ -809,12 +819,77 @@ static int fimd_power_on(struct fimd_context *ctx, bool enable)
>> return 0;
>> }
>>
>> +#ifdef CONFIG_OF
>> +static struct exynos_drm_fimd_pdata *drm_fimd_dt_parse_pdata(struct device *dev)
>> +{
>> + struct device_node *np = dev->of_node;
>> + struct device_node *disp_np;
>> + struct exynos_drm_fimd_pdata *pd;
>> + u32 data[4];
>> +
>> + pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
>> + if (!pd) {
>> + dev_err(dev, "memory allocation for pdata failed\n");
>> + return ERR_PTR(-ENOMEM);
>> + }
>> +
>> + if (of_get_property(np, "samsung,fimd-vidout-rgb", NULL))
>> + pd->vidcon0 |= VIDCON0_VIDOUT_RGB | VIDCON0_PNRMODE_RGB;
>> + if (of_get_property(np, "samsung,fimd-inv-hsync", NULL))
>> + pd->vidcon1 |= VIDCON1_INV_HSYNC;
>> + if (of_get_property(np, "samsung,fimd-inv-vsync", NULL))
>> + pd->vidcon1 |= VIDCON1_INV_VSYNC;
>> + if (of_get_property(np, "samsung,fimd-inv-vclk", NULL))
>> + pd->vidcon1 |= VIDCON1_INV_VCLK;
>> + if (of_get_property(np, "samsung,fimd-inv-vden", NULL))
>> + pd->vidcon1 |= VIDCON1_INV_VDEN;
>> +
>> + disp_np = of_parse_phandle(np, "samsung,fimd-display", 0);
>> + if (!disp_np) {
>> + dev_err(dev, "unable to find display panel info\n");
>> + return ERR_PTR(-EINVAL);
>> + }
>> +
>> + if (of_property_read_u32_array(disp_np, "lcd-htiming", data, 4)) {
>> + dev_err(dev, "invalid horizontal timing\n");
>> + return ERR_PTR(-EINVAL);
>> + }
>> + pd->panel.timing.left_margin = data[0];
>> + pd->panel.timing.right_margin = data[1];
>> + pd->panel.timing.hsync_len = data[2];
>> + pd->panel.timing.xres = data[3];
>> +
>> + if (of_property_read_u32_array(disp_np, "lcd-vtiming", data, 4)) {
>> + dev_err(dev, "invalid vertical timing\n");
>> + return ERR_PTR(-EINVAL);
>> + }
>> + pd->panel.timing.upper_margin = data[0];
>> + pd->panel.timing.lower_margin = data[1];
>> + pd->panel.timing.vsync_len = data[2];
>> + pd->panel.timing.yres = data[3];
>> +
>> + of_property_read_u32(np, "samsung,fimd-frame-rate",
>> + &pd->panel.timing.refresh);
>> +
>> + of_property_read_u32(np, "samsung,default-window", &pd->default_win);
>> +
>> + of_property_read_u32(np, "samsung,fimd-win-bpp", &pd->bpp);
>> +
>> + return pd;
>> +}
>> +#else
>> +static struct exynos_drm_fimd_pdata *drm_fimd_dt_parse_pdata(struct device *dev)
>> +{
>> + return NULL;
>> +}
>> +#endif /* CONFIG_OF */
>> +
>> static int __devinit fimd_probe(struct platform_device *pdev)
>> {
>> struct device *dev = &pdev->dev;
>> struct fimd_context *ctx;
>> struct exynos_drm_subdrv *subdrv;
>> - struct exynos_drm_fimd_pdata *pdata;
>> + struct exynos_drm_fimd_pdata *pdata = pdev->dev.platform_data;
>> struct exynos_drm_panel_info *panel;
>> struct resource *res;
>> int win;
>> @@ -822,7 +897,11 @@ static int __devinit fimd_probe(struct platform_device *pdev)
>>
>> DRM_DEBUG_KMS("%s\n", __FILE__);
>>
>> - pdata = pdev->dev.platform_data;
>> + if (pdev->dev.of_node) {
>> + pdata = drm_fimd_dt_parse_pdata(&pdev->dev);
>> + if (IS_ERR(pdata))
>> + return PTR_ERR(pdata);
>> + }
>> if (!pdata) {
>> dev_err(dev, "no platform data specified\n");
>> return -EINVAL;
>> @@ -1016,6 +1095,17 @@ static struct platform_device_id fimd_driver_ids[] = {
>> };
>> MODULE_DEVICE_TABLE(platform, fimd_driver_ids);
>>
>> +#ifdef CONFIG_OF
>> +static const struct of_device_id fimd_dt_match[] = {
>> + { .compatible = "samsung,exynos5-fimd",
>> + .data = &exynos5_fimd_driver_data },
>> + { .compatible = "samsung,exynos4-fb",
>> + .data = &exynos4_fimd_driver_data },
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(of, fimd_dt_match);
>> +#endif
>> +
>> static const struct dev_pm_ops fimd_pm_ops = {
>> SET_SYSTEM_SLEEP_PM_OPS(fimd_suspend, fimd_resume)
>> SET_RUNTIME_PM_OPS(fimd_runtime_suspend, fimd_runtime_resume, NULL)
>> @@ -1029,5 +1119,6 @@ struct platform_driver fimd_driver = {
>> .name = "exynos-drm-fimd",
>> .owner = THIS_MODULE,
>> .pm = &fimd_pm_ops,
>> + .of_match_table = of_match_ptr(fimd_dt_match),
>> },
>> };
>> --
>> 1.7.0.4
>>
>>
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